Rename clang to clang-cc.

Tests and drivers updated, still need to shuffle dirs.

llvm-svn: 67602
diff --git a/clang/test/Parser/check_cast.c b/clang/test/Parser/check_cast.c
index c69f0f0..4df851c 100644
--- a/clang/test/Parser/check_cast.c
+++ b/clang/test/Parser/check_cast.c
@@ -1,4 +1,4 @@
-// RUN: clang -fsyntax-only -verify %s
+// RUN: clang-cc -fsyntax-only -verify %s
 struct foo {
   int a;
 };